When players think of RPGs, they're often thinking of long, engaging stories affected by the player's actions. There's a lot of world-building, character building and interaction between various NPCs and factions to consider when creating an RPG world. That's why it comes as no surprise that novels are often used as source material to help with world-building. It's a lot easier to have a fleshed-out world history if that history has already been written.
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